At what age is the first dose of Oral Polio Vaccine $(OPV)$ and Hepatitis-$B$ vaccine given to a child?

  • A
    $6 \; \text{weeks}$ after birth
  • B
    $10 \; \text{weeks}$ after birth
  • C
    $20 \; \text{weeks}$ after birth
  • D
    $24 \; \text{weeks}$ after birth

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$(i)$ Alexander Fleming
$(ii)$ Louis Pasteur
$(iii)$ Walther Flemming
$(iv)$ Ernst Chain
$(v)$ Howard Florey
$(vi)$ Oswald Avery

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